Photocatalytic degradation of aqueous pollutants using silica-modified TiO(2).
Photocatalytic degradation of aqueous pollutants using silica-modified TiO(2).
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DOI：
10.1016/s0043-1354(03)00333-6
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发表时间：
2003-09
期刊：
影响因子：
12.8
通讯作者：
M. Vohra;Keiichi Tanaka
中科院分区：
文献类型：
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作者：
M. Vohra;Keiichi Tanaka
采用多孔二氧化硅包覆二氧化钛（SiO2-TiO2）光催化剂研究了几种含水污染物的光催化降解（PCD）。测试了几种阳离子、中性和阴离子污染物。结果表明，用二氧化硅修饰tio2的表面性质可显著提高阳离子污染物的PCD率。随着底物浓度的增加，速率的提高幅度减小，尤其是季胺，这归因于初始吸附量的减少。然而，乙酸酯和苯酚的速率没有显著提高。结果表明，催化剂表面阳离子污染物的存在增加导致了反应速率的提高。
Photocatalytic degradation (PCD) of several aqueous pollutants was investigated using a porous silica-coated titanium dioxide (SiO2–TiO2) photocatalyst. Several cationic, neutral and anionic pollutants were tested. The results indicate that modifying the surface properties of TiO2using silica significantly enhances the PCD rate of the cationic pollutants. The rate enhancement decreased with an increase in substrate concentration, especially for the quaternary amines, and was attributed to the decrease in initial adsorption. However, no significant rate-increase resulted for acetate and phenol. Results suggest that the increased presence of cationic pollutants at the catalyst surface caused the rate enhancement.